State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China.
China IPPR International Engineering Co., Ltd., Beijing 100089, China.
Sci Total Environ. 2022 Feb 20;808:151921. doi: 10.1016/j.scitotenv.2021.151921. Epub 2021 Nov 24.
Ozone has been widely applied during drinking water treatment for organic pollutants removal, however, the ozonation by-products such as bromate, aldehydes, and carboxylic acids could be produced. To investigate the ozonation by-products formation and control efficiency, a continuous pilot-scale system was established including conventional treatment and ozone-biological activated carbon (O-BAC) treatment processes in a waterworks that receives bromide-bearing source water from the Yellow River in northern China. It was found that ozonation could reduce the threshold odour number and the haloacetic acids formation potential effectively. As 1.8-2.6 mg/L of ozone was applied, the bromate concentration would exceed the standard of 10 μg/L. Simultaneously, ozonation led to a large number of formaldehyde, methylglyoxal and other aldehydes. At the ozone dosage of 3.0 mg/L, the total concentration of aldehydes reached the highest of 45.4 μg/L. Ammonia and hydrogen peroxide (HO) addition could inhibit the formation of bromate effectively. The application of HO induced an increase in aldehydes concentration reaching a maximum concentration of 57.6 μg/L. During the BAC treatment, the removal rate of aldehydes would reach 19%-41%. The addition of HO inhibited the formation of bromate but increased the production of aldehydes, thus it is important to search a balance point for controlling bromate and aldehydes simultaneously. The HO/O (g/g) of 1.0 could be possible to control both bromate and aldehydes concentrations within the standards.
臭氧已广泛应用于饮用水处理中以去除有机污染物，但会产生溴酸盐、醛类和羧酸等臭氧副产物。为了研究臭氧副产物的形成和控制效率，在一家水厂建立了一个连续中试系统，包括常规处理和臭氧-生物活性炭（O-BAC）处理工艺，该水厂从中国北方的黄河获得含溴水源。结果表明，臭氧处理能有效降低阈值嗅味数和卤乙酸生成潜能。当投加 1.8-2.6mg/L 的臭氧时，溴酸盐浓度会超过 10μg/L 的标准。同时，臭氧处理会导致大量甲醛、甲基乙二醛等醛类的生成。当臭氧投加量为 3.0mg/L 时，醛类的总浓度达到最高值 45.4μg/L。氨和过氧化氢（HO）的添加能有效抑制溴酸盐的生成。HO 的应用会导致醛类浓度增加，达到最高浓度 57.6μg/L。在 BAC 处理过程中，醛类的去除率可达 19%-41%。HO 的添加抑制了溴酸盐的生成，但增加了醛类的生成，因此寻找一个平衡点来同时控制溴酸盐和醛类的浓度非常重要。HO/O（g/g）为 1.0 时，可能将溴酸盐和醛类的浓度控制在标准范围内。
